38711981 has 16 divisors (see below), whose sum is σ = 48480768. Its totient is φ = 30030000.

The previous prime is 38711977. The next prime is 38711983. The reversal of 38711981 is 18911783.

It is not a de Polignac number, because 38711981 - 2² = 38711977 is a prime.

It is a super-2 number, since 2×38711981² = 2997234945888722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38711983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18326 + ... + 20328.

It is an arithmetic number, because the mean of its divisors is an integer number (3030048).

Almost surely, 2^38711981 is an apocalyptic number.

It is an amenable number.

38711981 is a deficient number, since it is larger than the sum of its proper divisors (9768787).

38711981 is a wasteful number, since it uses less digits than its factorization.

38711981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272.

The product of its digits is 12096, while the sum is 38.

The square root of 38711981 is about 6221.8952900222. The cubic root of 38711981 is about 338.2842659530.

The spelling of 38711981 in words is "thirty-eight million, seven hundred eleven thousand, nine hundred eighty-one".